MAIL_SERVER environment variable not specified. Using localhost by default. To specify it in bash: export MAIL_SERVER=localhost Vagrant could not detect VirtualBox! Make sure VirtualBox is properly installed. Vagrant uses the `VBoxManage` binary that ships with VirtualBox, and requires this to be available on the PATH. If VirtualBox is installed, please find the `VBoxManage` binary and add it to the PATH environmental variable.